A helmet comprises a crown and a neckband having a body. Right attachment point and left attachment point attach the neckband to the lateral parts of the crown. The body is installed movable between a use position where the body is salient from the crown and a stowed position where the body is installed in the cavity. The inner face of the body is facing the rear inner face of the crown in the stowed position. The body is of curved shape and moves between the positions by turning elastically. The body is connected to the right attachment point and the left attachment point by a flexible attachment formed by a flexible textile element or a strip of elastomer material. The flexible attachment is elastically deformable in three-dimensional manner.

The present disclosure relates to a helmet fitting system and a manufacturing method therefor. The helmet fitting system according to the present disclosure includes a band (100) having one end fixed to a certain point (X) of a helmet (10), a fitting unit (200) connected to the band (100) and configured to provide an elastic force to the back of a wearer's head, and an adjustment means (300) configured to adjust the elastic force of the fitting unit (200).

A head-mounted display system includes a head-mounted display unit and a positioning and stabilising structure structured and arranged to hold the head-mounted display unit in an operational position over a user's face in use. The positioning and stabilising structure includes a rear support structure adapted to contact posterior regions of a user's head and at least one connector structured and arranged to interconnect the rear support structure to the head-mounted display unit. The rear support structure is in the form of a hoop comprising an occipital portion configured and arranged engage the user's head along a portion of the occipital bone adjacent a junction where the neck muscles attach to the occipital bone in use.

In an embodiment a protective helmet includes an outer shell configured for distributing impact forces, a support structure spaced apart from and supporting the outer shell, the support structure placeable on a head of a wearer of the protective helmet, wherein the support structure is subdivided into a front support and a rear support spaced apart from the front support, and an adjustable tensioning device configured for exerting a tensioning force on the support structure so that a force flow of the tensioning force for fixing the outer shell on the head of the wearer flows completely through the outer shell and for varying the tensioning force by an adjustment.

A headband ratchet mechanism for tightening/loosening the headband of a safety helmet is operated by a knob that rotates in tightening and loosening directions to tighten or loosen the headband about the head of a wearer of the safety helmet. A ratchet mechanism resists loosening of the headband during normal use of the safety helmet. A quick-release mechanism actuatable by the wearer enables headband tension to be relieved without rotating the knob.

Disclosed are adjustable helmet retention systems and helmet and adjustable retention assemblies that solve problems in the prior art. Specifically, disclosed are helmets and adjustable retention assemblies, including a helmet shell and an adjustable retention system that includes one or more retention straps or cables and one or more actuators. The adjustable retention system may comprise a single retention strap or cable having a chin strap subcomponent configured to engage a wearer's chin, a fit strap subcomponent configured to engage a wearer's head, including the occipital portion, and one or more actuators configured to selectively shorten or lengthen the retention strap or cable relative to the wearer's head. The adjustable retention system may alternatively comprise a separate chin strap and chin strap actuator and a separate fit strap and fit strap actuator.